Abstract: Hydroxyethyl methacrylate (HEMA) was grafted on micron-sized silica gel particles via surface-initiated graft-polymerization with amino-persulfate redox system, obtaining the grafted particles PHEMA/SiO2 with a high degree. Subsequently, the nucleophilic substitution reaction of the grafted PHEMA with 5-chloromethyl-8-hydroxyquinoline (CHQ) as reagent was carried out, and the 8-hydroxyquinoline-functionalization transform of the grafted particles PHEMA/SiO2 was realized, preparing the functional grafted particles HQ-PHEMA/SiO2 with. The strong chelating adsorption property of HQ-PHEMA/SiO2 towards Cd2+ ion was investigated in depth. On that basis, the ion imprinting towards the functional grafted macromolecules HQ-PHEMA was conducted with Cd2+ ion as the template ion and dichloroether as crosslinker by using the novel surface imprinting technique found up by our research group, and Cd2+ ion surface-imprinted material IIP-HQP/SiO2 was prepared. The ion recognition and combination characters were examined and researched in depth. The experimental results show that this ion imprinted material has excellent recognition selectivity and combination affinity for the template Cd2+ ion. Relative to the contrast ions, Cu2+ and Pb2+ ions, the coefficients of selectivity of IIP-HQP/SiO2 for Cd2+ ion reach up to 25.52 and 22.91, respectively, displaying ultrahigh ion recognition ability.
Template and target information: cadmium ion, Cd(II)
Author keywords: heavy metal ion, ion surface-imprinting, graft polymerization, 8-Hydroxyquinoline, Chelation adsorption, ion recognition